iPhone 12 Connection: 2012 Honda Accord Aux Connection - iPhone 12 not playing Music

HondaAuxConnection,

If the steps from the article above did not resolve the issue, make sure your iPhone 12 is updated to iOS 14.3 and your Honda also has the latest software update installed. This article from Honda has information on how you can update the Display Audio under the heading, "Software System Updates", which you may find useful:

https://owners.honda.com/vehicles/subscriptions-downloads-updates

Regards.

Hello HondaAuxConnection,

Thank you for using Apple Support Communities!

We understand from your post that your iPhone 12 is not working connected via AUX cord to your vehicle while your iPhone 11 does work connected in the same way. This article is written for using headphones with your iPhone, but some of the same steps like checking the iPhone 12 Lightning port for debris and making sure everything has been inserted all the way may help.

If your headphones don't work with your iPhone, iPad, or iPod touch - Apple Support

Best Regards.